Why we are conducting vector group test in transformer?
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A vector group test ensures all the primary and secondary winding ends have been identified and terminated correctly. Most importamtly it confirms ( or otherwise) that the start and finish of each winding have been identifiedand connected correctly.
It is possible to have two transformers of identical rating and appearance wirh identical output phase-to-phase and phase-to neutral voltage readings. But if for example one transformer has all its secondary winding starts connected to the star point, and the other has its finishes connected to the star point, each output of one transformer will be 180 deg out of phase with the same output of the other. This means any attempt to parallel the transformer outputs to achieve redundancy will fail.
A properly conducted vector group test will uncover this type of fault before despatch. Also it is common practice for the customer to specify the required vector grouping, e.g. Dyn11. And its always a good idea to follow a customer’s specifications where possible
It is possible to have two transformers of identical rating and appearance wirh identical output phase-to-phase and phase-to neutral voltage readings. But if for example one transformer has all its secondary winding starts connected to the star point, and the other has its finishes connected to the star point, each output of one transformer will be 180 deg out of phase with the same output of the other. This means any attempt to parallel the transformer outputs to achieve redundancy will fail.
A properly conducted vector group test will uncover this type of fault before despatch. Also it is common practice for the customer to specify the required vector grouping, e.g. Dyn11. And its always a good idea to follow a customer’s specifications where possible
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